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The heaters in the auto AAR valve look much like the auto-choke heaters on carbs. My guess is theye elements get thin and high resistance as they corrode. ISTR a new choke heater element came to around 12 ohms and an old to more like 20 when I measured them recently. Maybe this is what has happened here, so the valve doesn't get hot enough for the bimetal coil to close it completely. I guess an internal adjastment may be needed if you can do what Russ suggested. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~